Georg steinike and friedrich schmidt



UNITED STATES PATENT @rrrcn.

GEORG STEINIKE AND FRIEDRICH SCHMIDT, OF HUOHSTON-THEdlAIN, GERMANY, ASSIGNORS TO THE FARBVVERKE, VORMALS MEISTER, LUOIUS d5 BRUNING, OF SAME PLACE.

BLACK DlSAZO WOOL-DYE.

SPECIFICATION formingpart of Letters Patent No. 603,093, dated April 26, 1898.

Application filed July 22, 1893. Serial No. 481,222. (Specimens) Patented in Germany November 6, 1891, No. 73,170, and May 16, 1893,1To. 79,644.

To (0Z6 whom, it may concern.-

Be it known that we, Gnoncr STEINIKE and FRIEDRICH SCHMIDT, doctors of philosophy, citizens of the Empire of Germany, residing at llochst-on-the-lliain, in the Empire of Germany, have invented certain new and useful Improvements in the Production of Colorlug-Matters, (for which Letters Patent were granted in Germany by and with our consent to the Farbwerke, vormals Meister, Lucius do Briining, No. 73,170, of 1891, and No. 79,644, of 1893 and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Our invention relates to the production of black disazo dyestuffs for W001 by the action of two molecules of a diazo compound upon one molecule of dioXynapht-halene sulfonic acid S of United States Letters Patent No. 444,679. This acid possesses, as we have found, the ability to combine in an alkaline or acid-andalkaline solution with two molecules of a diazo compound. Among the most valuable of the numerous possible combinations are to be considered those in which one of the two diazo compounds is a naphthylaminmonosulfonic acid.

To produce such dyestuffs, we proceed, for instance, as follows: 2.62 kilograms of dioxynaphthalenesulfonate of sodium S are, together with 2.2 kilograms of calcined soda in water, brought to a solution of ten to fifteen per cent. 2. 23 kilograms of naphtliionic acid are diazot-ized in the usual way and run into the alkalinesoda solution of dioxynaphthalenesulfonic acid S at about 5 centigrade and stirred for six hours. After this time the violet-red monoazo dyestuif is formed. 4.4 kilograms of calcined soda, or preferably 1.6 kilograms of caustic sodium, are added. Then under good stirring an alpha-diazonaphthalene solution obtained in the usual manner from 1.43 kilograms of alpha-naphthylamin is slowly run in at a temperature of 0 centigrade. After a lapse of twelve hours the formation of the disazo dyestuff is complete.

The d yestuif is separated from the solution in the usual manner with common salt. It

forms in a solid form a dark powder of bronzelike luster, is easily soluble in water with a violet color, and soluble with difficulty in alcohol with a reddish-blue color. The aqueous solution turns redder on addition of ammonia. The solution in concentrated sulfuric acid separates, on the addition of water, the dyestuff as a reddish-violet precipitate.

The dyestufi dyes wool in an acid-bath blu ish black and produces on chrome-mordants a deep black.

The formation of the dyestuff may be illustrated by the following equations:

Dioxynaphthalenesulfonic acid S Diazotized amin of the benzene or naphthalene series,

by the action of one molecule of a diazotized naphthylaminsulfonic acid and one molecule of a diazotized amin of the benzene or naph thalene series upon one molecule of dioxynaphthalenemonosulfonic acid S of the United States Patent No. 444, 679, substantially as described.

2. As new products, the black disazo dyestuffs for wool, obtained by the action of one molecule of a diazotized alphamaphthylamim sulfonic acid and one molecule of a diazotized amin upon one molecule of dioxynaphthaleneand forming a dark powder of bronze-like luster, easily soluble in water with a violetcolor, soluble with difliculty in alcohol with a red dish-blue color and insoluble in benzene, the aqueous solution of which turns redder on addition of ammonia, While in concentrated sulfuric acid the dyestuff is soluble with a pureblue color and is separated on addition of water as a reddish-violet precipitate, and dyes wool blue-black in an acid-bath, substantially as set forth.

In testimony whereof we aflix our signatures in presence oftwo witnesses.

GEORG STEINIKE. FRIEDRICH SCHMIDT.

lVitnesses:

J OSEF REVERDY, HEINRICH HAHN. 

